And of course you need a couple of Dial indicators.....
These we got from Enco...... $20.95...each.....
You want the 2" kind because it allows the pointer to reach the plate and also you want to set it at the 1" mark and at depending on the hub's direction of travel will go in or out...... so on the 1" mark we can measure the amount of movement we have and which direction it goes....